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Discussion Starter · #1 ·
On a 1.4 Mg zr there about 100 quid .... Anyone know if there any good and wether they are safe, cos ive herd a few roomers that they just fuck ya engine.

Cheers

oh and what do they do ? just giv the engine more petrol ????
 

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they change the ratio of fuel delivered. Without a proper RR tune up, they can cause a bit of damage.
Running lean - burns the valve seats - preignition
Running Rich - bore wash
 
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